This is all just my opinion.
They could raise the max level from SR130 to around SR200. That would be available after the second map pack. If they come out with another set of map packs, the same thing could be done to SR270. Around half a year after the last map pack has been released, the max level would be raised to SR343. 343i would owe you a steak dinner once you get to the final max level. LOL
Plus in the map packs they could add non-power weapons that weren’t included initially and make them available as unlocks. For example, something like the needle rifle would be unlocked at SR250.
If provisions like this were added, it would really give people an incentive to buy the maps packs / continue to play and it would therefore increase the game’s lifespan.